Study to Assess the Efficacy and Safety of Ublituximab + Umbralisib With or Without Bendamustine and Umbralisib Alone in Patients With Previously Treated Non-Hodgkins Lymphoma

Inclusion Criteria

• Diagnosis of Non-Hodgkin's Lymphoma including Follicular, Mantle Cell Lymphoma and Marginal Zone Lymphoma
• Relapsed or refractory to prior standard therapy and subjects who are not candidates for high-dose therapy or autologous stem cell transplant
• MCL subjects with one or more lines of therapy including at least one BTK inhibitor (ibrutinib, acalabrutinib or zanibrutinib only)

Exclusion Criteria

• Any major surgery, chemotherapy or immunotherapy within the last 21 days
• Evidence of hepatitis B virus, hepatitis C virus or known HIV infection
• Autologous hematologic stem cell transplant within 6 months of study entry. Prior Allogeneic hematologic stem cell transplant is excluded
• Prior therapy with a PI3K delta inhibitor